Blood and Hemopoiesis Flashcards
4 functions of blood
Transport
Homeostasis
Hemostasis
immunity
What percentage of our total body weight does blood account for
8%
What percentage of blood is plasma
55%
What is the name of the layer of centrifuged blood that contains the platelets
Buffy coat
List the plasma proteins
Albumin, Gloublin, Fibrinogen
What is the function of albumin
maintains colloid osmotic pressure
What is the function of gloublin
transports protein and for immunity
What is the function of fibrinogen
coagulation
What is the other name for red blood cells
Erythrocytes
What is the other name for red blood cells
Leukocyte
What is the other name for platelets
Thrombocytes
What are the two main types of leukocytes
Granulocytes and agranulocytes
What is found in the formed elements layer of blood
Erythrocytes, Leukocytes and Thrombocytes
Examples of granulocytes
Basophils, eosinophils, neutrophils
all the ones “philled” with granules
Examples of agranulocytes
Monocytes and lymphocytes
True or False:
There are more leukocytes than platelets in the blood
False.
There are ~5,000-10,000 leukocytes and 140,000-340,000 platelets
Long-lived tissue phagocytes are made by which organ fetally
Yolk sac
T cells are made by which organ
Thymus
Which fetal organ does hematopoiesis 16 days to 10 wks gestation
Yolk sac
Which fetal organ does hematopoiesis 6 wks gestation to birth
Liver
Which fetal organ does hematopoiesis 5 mths gestation to death
bone marrow
maturing blood cells are released into the blood stream through which structure
Vascular sinus walls
Which bones in the body produce the MOST blood
Vertebrae and pelvis
Which bones in the body produce the LEAST blood
Tibia and femur
Which soluble factor guides the development of hematopoietic stem cells
Cytokines
What changes occur during erythropoiesis
Reduction in size
Increase in the amount of cytoplasm
Decrease in the size of nucleus
Staining changes
Disappearance of nucleus
Which hormone stimulates erythropoiesis
Erythropietin
What is the main stimulus for erythropoietin
Hypoxia
Which organ secretes the most erythropoietin
Kidney
Which two organs secrete erythropoietin
Liver
5 factors that can cause decreased oxygenation
low blood volume
anemia
low hemoglobin
poor blood flow
pulmonary disease
Which 2 dietary factors are needed for maturation of RBCs
Vitamin B12 and folic acid
What process does folic acid and vitamin B12 acid in, during RBC maturation
DNA synthesis & cell division
What condition results due to a deficiency of folic acid or vitamin B12
macrocytic anemia/ pernicious anemia/ megoblastic anemia
Which molecule aids in the absorption of vitamin B12 for RBC maturation
Intrinsic factor (released from parietal cells)
At which cell level in erythropoiesis does globin synthesis begin
At the proerythroblast level
What is the hemoglobin concentration in red cell cytosol
~5.5mM
List some proteins used to maintain the shape of red blood cells
Actin, spectrin, ankyrin, band 4.1, band 3
What is the purpose of the band 3 protein used to maintain the shape of RBCs
Cl-HCO 3 exchange
What are the advantages of RBCs being shaped like biconcave discs
Larger surface area to volume ratio
Maximizes diffusion area and minimizes intracellular diffusion distances
Increase in which immature RBC is an indication of erythropoiesis
Reticulocytes
What are the three morphological changes that can occur in RBCs
Change in shape
Change in size
Change in color
Immature cells
What are the three types of RBCs according to size
Microcytes
Normocytes
Macrocytes
What are the two types of RBCs according to colo
Normochromic and hypochromic
What are the two metabolic pathways which occur in RBCs
Glycolysis and Pentose shunt
In RBCs, which glycolytic intermediate is used to generate NADPH
Glucose-6-phosphate
(can be remembered by saying, if it’s the pentose pathway that we get NADPH, we are going to need something with a little more than 5)
Which molecule in RBCs plays a role in oxygen dissociation
has 2,3-diphosphoglycerate (2,3-DPG)
D word helps with dissociation
Which substance protects RBCs against oxidant damage
glutathione
What is the second most abundant membrane protein in RBCs
AQP1
Which molecule contribute more than half of the CO 2 permeability of the RBC membrane
AQP1
What are the two molecules contained within heme
iron and protopophyrin
True or False, oxygen binds irreversibly to iron in the heme molecule
False, oxygen binds reversibly
how many heme molecules are in 1 hemoglobin molecule
4
how many molecules of oxygen can 1 hemoglobin molecule carry
4 molecules of oxygen (8 atoms, remember O2)
What kind of polypeptide chains is each hemoglobin molecule made up of
2α & 2β
How many amino acids does each alpha and beta chain have in the hemoglobin molecule
141 and 146 respectively
What are the 2 types of adult hemoglobin
HbA1: 2α & 2β chains
HbA2: chains 2α & 2δ chains
What kind of chains is the fetal hemoglobin made of (HbF)
2α & 2γ chains
*remember alpha always, beta becomes, gamma goes
True or False, iron absorption is very slow
True
Which molecule is essential for the formation of hemoglobin
Iron
What is the life span of a RBC
120 days
What is the name of the system in which destruction of RBCs occur
Reticuloendothelial system
What is hematocrit
Fraction of blood volume that is red cells
What kind of patients have an elevated erythrocyte sedimentation rate
patients with infection, autoimmune and inflammatory disease
What calculation is used to calculate the average volume of each RBC
Mean corpuscular (cell) volume (MCV)
What calculation is used to calculate the average hemoglobin content of each RBC
Mean corpuscular (cell) hemoglobin (MCH)
What calculation is used to calculate the average Hgb content in the mass of circulating RBCs
Mean corpuscular (cell) hemoglobin concentration (MCHC)
What are 2 causes of anemia
deficiency of hemoglobin due to decreased RBCs and decreased hemoglobin in the cells
What are the types of anemia
Blood Loss Anemia.
Aplastic Anemia Due to bone marrow
dysfunction.
Megaloblastic Anemia.
Hemolytic Anemia.
5 effects of anemia on the CVS
Blood viscosity decreases Increased cardiac output tissue hypoxia increase in CO extreme hypoxia in exercising tissue
What are the two types of Polycythemia
Secondary Polycythemia. Polycythemia Vera (Erythremia).
4 effects of polycythemia on the CVS
increased blood viscosity
increased blood volume
normal cardiac output
increased arterial pressure
Where on RBCs are antigen (agglutinogens)
On the surface of the RBCs
Where are antibodies found
Blood plasma
How many blood group antigens are there
300
What are the 2 main blood group systems
ABO system and Rh system
What are the 4 blood types according to the ABO system
A, B, AB, O
On which macro molecules are ABH antigens seen
glycoproteins and glycolipids
ABH antigens are synthesized in a stepwise fashion by which enzyme
glycosyltransferases
determines antigen specificity
The terminal sugar
Which sugar is the precursor for A and B antigen
Fucose
Which blood group has H antigens only
O group
Which molecule is added by A-transferase in blood groups
N -acetyl- d -galactosamine
Which molecule is added by B-transferase in blood groups
d -galactose
What age is the peak of antibody production
5-10 years
Which antibody causes transfusion reactions following ABO-incompatible transfusions
IgM
The ABO blood group gene is found on which chromosomes
Autosomal chromosomes
How many copies of the ABO gene does each person have
2 (1 from each parent)
Which blood group does not have any antibodies in the plasma
AB group
The Rh factor is a system composed primarily of which antigens
C, D, and E
Which antigen is the most antigenic component and hence given the term Rh-positive
D antigen
True or False, Rh negative persons have no D antigen in their plasma but has anti-D agglutinin
False, Rh-negative individual has no D antigen and no anti-D agglutinin
Which Rh type is more common
Rh positive
True or False:
Anti-D antibodies do not develop without exposure of a D-negative individual to D-positive red cell
What is the underlying basis of Rh hemolytic diseases
If a mother is Rh negative and is pregnant with a Rh positive child, cells from the child will enter the mother’s blood stream and she will develop anti-D antibodies 2-4 months after.
When she becomes pregnant again with another Rh positive child, her anti-D antibodies will attack the fetus
When do the anti-D antibodies develop on a Rh negative person
after exposure to Rh positive cells from a positive individual
How long after exposure to a Rh positive individual do Rh anti-D antibodies in a Rh negative person reach its maximum concentration
2- 4 months after exposure
What are the three methods of blood typing
ABO typing, Rh typing and cross matching
Which blood group is the universal donor
O group
Which blood group is the universal acceptor
AB
What are the 6 types of transfusion reactions
acute hemolytic febrile reactio allergic hypervolemic septic transfusion-related acute lung injury
What is the antibody found in Oh (Bombay) individuals
Potent anti H (can only be transfused with H-RBCs)